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Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax | 15,000 | 113,000 | 154,000 | 238,000 |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax | (45,002,000) | 4,858,000 | (100,765,000) | (8,739,000) |  |  |  |
Other comprehensive loss before reclassifications | (44,987,000) | 4,971,000 | (100,611,000) | (8,501,000) |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax | 52,000 | 0 | 52,000 | 0 |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 52,000 |  | 52,000 |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | 67,000 | 113,000 | 206,000 | 238,000 |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | (45,002,000) | 4,858,000 | (100,765,000) | (8,739,000) |  |  |  |
Other comprehensive income (loss) | (44,935,000) | 4,971,000 | (100,559,000) | (8,501,000) |  |  |  |
Changes in pension plan assets and benefit obligations, Net-of-tax amount | (5,792,000) | (34,421,000) | (5,792,000) | (34,421,000) | $ 5,792,000 | $ 5,792,000 | $ 34,421,000 | $ 34,421,000
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | 0 | (460,000) | 0 | (460,000) | (67,000) | (206,000) | (573,000) | (698,000)
Unrealized gains on available-for-sale securities, Net-of-tax amount | (79,612,000) | 31,951,000 | (79,612,000) | 31,951,000 | (34,610,000) | 21,153,000 | 27,093,000 | 40,690,000
Total accumulated other comprehensive income (loss), Net-of-tax amount | $ (85,404,000) | $ (2,930,000) | (85,404,000) | $ (2,930,000) | $ (40,469,000) | $ 15,155,000 | $ (7,901,000) | $ 5,571,000
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent |  |  | $ 66,000 |  |  |  |  |

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